Control mechanism



Patented @et 2%, lge.

UNLTME J'OHN'R. MASON, OF CHECAGO, LLINOEPS, ASSEGNOR THEB'IOSESROSENTHAL COM- PANY, O31 CHICAGO, LLNQIS,

A, CORPGRATEQN F ILLINOIS.

CONTRGL UIECHANISM.

Application led lecember 14, 1921. Serial No, 522,301.

Tov all whom it many concern.'

Be it known thatv I, JOHN lt. ll/iiisoN, a citizen ot the United States,residing at 913 West Van Buren Street, Chicago, in the 5 county of Cookand State of Illinois, have invented a new and useful Improvement inControl Mechanism, oit which the following is a specification.

My invention relates to mechanism controlling the driving of one memberfrom another and involving an element which is movable against anormally acting torce, to eect driving connection between suchniembeprs, and more especially where such element in its movement todilerent positions, et fects the acceleration of the speed at which thedriven member is driven, l having de# vised my invention for use, moreparticularly, in connection with treadle-controlled power-driven sewingmachines, such as are commonly used in garment factories. Y

As control mechanisms, especially for sewing machines, have hithertobeen provided, the operator is required at all times during the drivingof the driven member from the drive member,- to exert a force inopposition to the torce which tends to disconnect the driven member fromthe drivev member' and this condition presents great disadvantages,especially in connection with treadle--controlled sewing machines,which, during the greater part of their operation, are operated at thehighest speed attainable from the drive member. It has been found thatin garment-making factories, where the operators operate the sewingmachines for many hours at aA time, that the operating of thecontrolling treadles tires the operators to such an extent that theoperators are ot ten incapacitated for continuous work and toward theend of the da)7 often operate the machines at a much reduced speed, ascompared with the maximum speed, with consequent inetliciency andreduced output. Furthermore, the vvconstant pressure required to beovercome "by the operator in maintaining thefmachines'in operation, hasa tendency, particularlyV ltoward the end of the days work, to renderthe controlling ot" the speed at which the machine is driven, lessaccurate than would be the case it the condition above stated did notexist.

My primary object is to provide improvements in controlling mechanism,whereby when the mechanisml is operated to aposi*- tion causing themachine to run at full speed, the control mechanism becomes releajsa-blylocked in such position and does not require application by the operatorof continuing torce, but which may be readily actuated by the operatorto released condition, and where, as in the case of a sewing machine,provision is made for driving the driven element at varying speeds,depending upon the amount of pressure applied by the operator, theoperator upon release of the holding mechanism referred to mayaccurately control the speedv at which thedriven element is operatedfrom the driving.` ele ment, all to the end of rendering the opel-aM tormore etlicient, relieving the operator from undue strains and tiring'effects, and insuring the production of a better product and effectinggreater economy in the production of the same.

, Referring to the accompanyingdrawing; Figure l is a view in endelevation of mechanism for driving a sewing machinetrom a continuouslyoperatingpower device and in which my invention is incorporated; andFigure 2, a broken view in side elevation ot a portion of the mechanismshown in Fig. l. The particular illustrated embodiment o i' my inventionshows it as incorporated in a power driven sewing machine comprising atransmitter commonly known as a Union special belt adjusting powertransmitter, and through which the drive of the sewing machine properrepresented atlOl is effected from a source of power, shown as a drivepulley l0.

The transmitter shown, and of the specific construction above referredto, is represented at 13 and is formed ot a stationarily supported shafton which the stepped pulley l2, formed of the two united pulley sections12a and 12b, and the pulley 200, are journailed, the pulley i2 beingslidable length wise of the shaft l0() toward and away` from vthe pulley200. The pulley 12`is ,driven by a belted connection ll `with the p'. eyVl0, this belt engaging either of' the 'pulley-sections la or 19h, asdesired, and'furnis ng a constant driving connection between theipulleyl2 and the pulley 10. V The dri oifthe sewing machine proper lOl isthrough the medium of a belt 201 engaging Vthe"'pulley 200, the pulley200 being driven roiiithe pulley 12'by means oftapered friction clutchsurfaces provided on these two pulley memment fith each other. l mentbetween the pu trolled by a lever i4 p ,t

atively sL -L- fr', n tationary part oi th machine, this lever beingshown, in the drawings, in normal position in which the sewing proper101 at illhen the lev rocked in clount-erclcclrwise direction in l 2, itforces the pulley 12 into engagen with the pulley 200 at the frictionsur referred to, there' y the sewirfy chine proper 101 to ce driven, thespeed at which the latter is operated dependii the p sition to which thelever 14 pressed. all as is well known in f thereforer` further detailedtransmitter mechanism and its operation is unnecessary.

In the particular oo L lever 14 is pivotally connecter end with theupper end of a roc 15 are;l ably formed of sections 16 and 1? extendingqin parallel relation and adiustable le,

wise of each other and held together in adjusted position by a collar 18provided with set screws 19 for engaging thee-r4 rod ctions, the lowerend of the rod section 17 being pivotally connected with ievm1 betufeenthe ends of the latter, es indie s l 21, one end of the lever 2G beingfulcrumed at 22 on braclret 23 dependinc from the platform 24 on whichthe s .nachine proper 101 is supported. rThe other eA d of the lever ispivotally connected wi one end of a toggle 26, the sections ai il 28 .ofwhich are pii'f'otally connected together at their adjacent ends by apivot pin 29, the upper end of the toggle pivotally connected at 30 witha bracket 31 secured to the nderside of the plat-form 24. rlhe pivot 29is located at ay point in the rear of a line drawn through the pivots 25and 30, considering the toggle in fully extended position as representedby the dotted lines in the drawing, and the inner abutting end-surfaces32 of the sections 27 and 23 extending preferably substantially a rightangle to the longitudinal planes of these sections, whereby theseend-surfaces 32 form stops limiting the movement of the sect-ions 27 and28 relative to each other in the application of force thereto, tendingto straighten the toggle. The section 28 of the toggle is pivotallyconnected with the upper end of a rod 33, the lower end of which ispivotally connected with the rear end of a treadle 34 pivoted betweenits ends, at 35, on a bracket 36 rising from the floor, represented at37. The rod 33 is preferably formed of two rod sections 38 and 39, whichentend parallel with each other and are lengthwise adjustable forvarying the effective length of the rod 33, in collars 40 with setscrews 41 surrounding the rod sections and holding their 1Aether inadjusted position. rllhe connectA i of tlie rod with the` vtoggle ispreferaoiy at sleeve: 42, adjusts-.bly mounted ou t toggle section 28, aset screw 43 being;`

' et for clamping the sleeve in adjust- 'fon on this toggle section, andwith eeve the upper end of the rod secpivotally engages, indicated at44. the normal position of the parts, namelyv when the lever 14 is inuppermost position and the sewing machine proper 101 driven through thetransmitter, is at rest, the parts occupy the position shown in fulllines in the drawing, these parts being held in this position by thespring tension resisting the depression of the lever 14. To eectdrii-.fing connection between the drive ele nient 1G and the sewingmachin-e proper 101, the operator, whose foot rests upon the trea `le34, roclrs the latter in counter-clockwise direction in the drawing withthe result of causing the toggle 26 to swing toward straightenedposition, thereby rocking the lever 2O downwardly and drawing down or.the lever 14, which so conditions the transmitter that drive of thesewing machine proper 101 is established, the speed at which the latteris driven depending on the extent to which the lever 14 is lowered inthe ope-1 ation stated. rlo drive the sewing machine proper 101 at themaximum speed, the oper ator roclrs the treadle 34 in the directionstated to a position in which the toggle assumes vthe straight conditionshown by thc dotted lines in the drawing, in which position the stopsurfaces 32 abut. ln thus actu-- ating the toggle, the pivot 29 is movedrearwardly of a line passing through the pivot points 25 and 30 and thusthe control mech anisin becomes automatically locked in the dottedposition shown in the drawings and maintains maximum drive of the sewingniachine 101 without requiring the exertion of continuing pressure bythe operator against the treadle. rlhe toggle, however, may be readilyoperated to move the pivot 29 forwardly of the line connecting thepivots and 30 by the operator exerting an upward thrust on the rod 33,which may be accom plished by rocking the treadle 34 in clockwisedirection in the drawing, and as soon as the pivot 29 has movedforwardly of the line referred to, the spring tension exerted by thetransmitter on the lever 14, tending to move the latter to normalposition, returns all of these parts to this position except asrestained by the operator in pressing against the treadle 34 in theopposite direction. From the foregoing it will be noted that theoperator has complete control over the drive of the sewing machine fordriving it at any desired speed, and that during Hill the driving of thesewing machine at maximum speed noforce is required to be exerted by theoperator in maintaining such speed.

It will be noted that by providing the adjustment in the rod 15, themaximum speed at which the sewing machine proper is operated may bevaried, as desired.

lVhile I have illustrated and described my invention as applied to aparticular kind of machine and have shown and described a particularembodiment of my invention, I do not wish to be understood as intendingto limit it thereto, as it may be applied to other machines and may beprovided in various other forms, without departing from the spirit of myinvention.

l/Vhat I claim as new and desire to secure by Letters Patent, is:

l. The combination of a driving element, a driven element, meanstransmitting power from said driving element to said driven element andinvolving a movable member con trolling the drive, means tending to movesaid member to one. position, and means for moving said member inopposition to said second-named means comprising a treadle, a togglepivotally supported at one end, a pivotally supported lever connectedbeyond its pivotal support with the outer end of said toggle, saidmember operatively engaging said lever, and a connection between saidtreadle and said toggle between the points of its pivotal support andits connection with said lever, said toggle being so constructed andarranged that when actuated to extended condition it remains in suchcondition until force is reversely applied thereto.

2. The. combination of a driving element, a driven element, meanstransmitting power from said driving element to said driven element andinvolving a movable member con trolling the drive, means tending to movesaid member to one position, and means for moving said member inopposition to said second-named means comprising a. treadle, a togglethrough the medium of which said member is actuated, and atoggle-operating link engaging one of the sections of said togglebetween the ends of said section, said toggle being so constructed andarranged that when actuated to extended condition it remains n suchcondition until force is reversely applied thereto.

The combination of a driving element, a driven element, meanstransmitting power from said driving element to said driven element andinvolving a` movable member controlling the drive, means tending to`move said member to one position, and means for moving said member inopposition to said second-named means comprising a treadle, a togglepivo-tally supported at one end Vand thro-ugh the medium of which saidmember is actuated, and a toggle-operating link engaging one oi' thesections of said toggle between the ends of said section, said togglebeing so constructed and arranged that when actuated to extendedcondition it remains in such condition until force is reversely appliedthereto.

fl. The combination of a driving element, a driven element, meanstransmitting power from said driving element to said driven eleme-nt andinvolving a movable member controlling the drive, means tending to movesaid memberto one position, and means for moving said member inopposition to said second-named means comprising a treadle, a togglethrough the medium of which said member is actuated, and a.toggle-operating link engaging one or' the sections oi said togglebetween the ends of said section, said toggle being so constructed andarranged that when actuated to extended condition it extends in a p-laneat an angle to said link and remains in such condition until force isreversely applied, thereto.

JOHN R. MASON.

